Those promotions have only a small niche audience. They make up around 10% of WWE's audience. Most people who turn off WWE stop watching wrestling. They don't watch those promotions. Most don't know what NOAH or New Japan is.Because everyone is a Smark in modern times, so WWE does carter to them and WWE carters to multi'million dollar companies that give them money, and two most of the "Smarks" you refer to just simply leave the product and watch NJPW, Noah, RoH, IMPACT, or just quit in.
Not everyone has smarky tastes. I.E - small wrestlers, indie darlings, etc. Yet these wrestlers have been pushed by WWE for years now barring a few exceptions like Reigns.